Bobbin



Amig m ma. c. E, CUNDEY www@ BOBBIN I I' Filed Feb. "1l, 1935 INVENTQR & I

ATTORN EY Patented Apr. 28, 1936 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to an improvement in bobbins of the general character described in United States Patent No. 1,834,914 of December 1, 1931, and it relates more particularly to the provision of means in the butt of the bobbin where it engages the spindle to effect rmer engagement between the bobbin and the spindle, in order to insure positive turning of the bobbin with the spindle, particularly on the starting and stopping thereof, and further to prevent the bobbin from rising with respect to the spindle due to centrifugal force resulting from the rapid rotation of the bobbin and the spindle.

My invention still further relates to simple, novel means for effecting this purpose Without adding to the cost of manufacture o-r assembly.

In the accompanying drawing:

Fig. 1 represents a fragmentary vertical section of a bob-bin and spindle.

Fig. 2 represents a section on line 2-2 of Fig. 1.

Fig. 3 represents a section on line 3 3 of Fig. 1.

Fig. 4 represents a perspective View of a bushing embodying my invention.

Fig. 5 represents a vertical sectional view of the bushing shown in Fig 4.

Referring to the drawing in which like reference characters indicate like parts, I designates the blade of the spindle to which is rigidly secured the Whirl 2. The extension 3 of the whirl 2 is provided with a recess 4 which is covered by a cap 5, the upper face of which forms a seat of the bobbin 6. 'I'he spindle is provided with a plurality of symmetrical, evenly spaced clutch members 8 which fulcrum at 9 against the blade I and which are provided with the bottom feet IIJ which are tensioned by the spring I2. 'I'he upper ends of the clutch members 8 are retained by the pendent sleeve I4. The structure so far described is conventional and forms no part of the present invention.

The bobbin 6 is provided with the bottom enlarged portion I 6 which is adapted to seat on top of the cap 5 and which is adapted to engage the clutch members 8. Usually in order to minimize wear the enlarged bottom portion I8 of the bobbin 6 is provided with a metal bushing which frictionally engages the clutch members 8. In order to accomplish the object of my invention, namely: to insure proper friction between the bobbin and the spindle and to guard against the tendency of the bobbin to rise from the spindle due to centrifugal force resulting from fast rotation of the spindle, I utilize a particular form of bushing of the general character illustrated in Figs. 4 and 5, which bushing is provided with the substantially cylindrical body portion I8, the bottom outwardly flared flange I9, and the upper portion which is formed in the inwardly extending projections 2! and outwardly extending pockets or recesses 20. The bottom flange I9 is 5 adapted to engage a corresponding seat in the bottom of the bobbin 6, as will be seen in Fig. 1, and the cylindrical portion I8 is adapted to engage a corresponding cylindrical portion of the internal opening in the lower part of the bobbin, 10 also shown in Fig. 1. The enlarged pockets 20 and the intermediate inward projections 2| are adapted to engage corresponding pockets and recesses 22 and 23 which are preformed in the upper part of the internal opening in the lower portion of the bobbin. After the bobbin has been assembled in position, as shown in Fig. 1, a plu-4 rality of punched pricks 24 are fo-rmed in the cylindric-al body I8 and are made to penetrate into the body of the bobbin, thus securing the bobbin fast to the bushing to insure rotation of the bobbin and the bushing together. The enlarged pockets are adapted to accommodate the upper outwardly flaring portion of the clutch members 8, and when the spindle is rotated at high speed centrifugal force not only tends to raise the bobbin from the spindle but also throws the upper portions of the clutch members 8 outward radially so that the upper portions of the clutch members 8 are thrown out radially against the pockets 28. In this construction the inwardly v offset upper edge 25 of the cylindrical portion I8 now forms a stop ring which will engage the lower portions of the clutch members, the upper portions of which have been thrown out radially by the centrifugal force resulting from rapid rotation, and will thus prevent the rise of the bobbin from the spindle. The formation of alternate pockets 20 and inward projections 2l in the bushing and the registration or the clutch l0 members 8 with the pockets 20 serve to key the bushing to the clutch on the spindle, thereby insuring positive engagement therebetween and assuring the turning of the bobbin With the rotanon of the spindle.

By this construction I have found that I have achieved the right amount of frictional eng-agement both vertically and radially to effect unitary turning of the bobbin and the spindle and to prevent the rising of the bobbin from the spindle as contradistinguished from other means heretofore employed which, while effecting suicient engagement between the bobbin and the spindle, nevertheless rendered the manual disengagement of the bobbin from the spindle, when it was Y all except the upper tip thereof, thereby aiording very little gripping or holding area, which makes Y,

it difficult to disengage a bobbin too tightly en# gaging the spindle, it being understood that it is not permissible to grasp the bobbin over the part thereof which is covered by yarn, since handling may seriously damage the yarn. Another advantage of my constructionvover previous constructions resides'in the firmer engagement of the bushing with the bobbin, due to spinning of the bushing within the bobbin to conform to the particular contour thereof as contradistinguished between a driven t of a straight bushing into a bobb-in which sooner or later tends to loosen and requires replacement. It is to be understood that, if desired, I may extend the bottom end of the bushing outwardly and upwardly completely to cover or encase the bottom lower portion of the bobbin.

I claim: y

A bobbin having the lower portion thereof internally bored for engaging the clutch of a spindle, the internal bore in the bottom of said bobbin comprising a lower relatively narrow cylindrical portion and an upper relatively enlarged cylindrical portion, said upper relatively enlarged portion having spaced pockets formed therein corresponding to and adapted tc receive the engaging parts of said clutch, and a metallic bushing secured in the bore of said bobbin and conforming to the internal contour of said upper and lower cylindrical portions. Y

CLARENCE E. CUNDEY. 

